Department of Sport Science, University of Innsbruck, Fürstenweg 185, A-6020 Innsbruck, Austria.
Sensors (Basel). 2024 Jan 29;24(3):871. doi: 10.3390/s24030871.
The Xsens Link motion capture suit has become a popular tool in investigating 3D running kinematics based on wearable inertial measurement units outside of the laboratory. In this study, we investigated the reliability of Xsens-based lower extremity joint angles during unconstrained running on stable (asphalt) and unstable (woodchip) surfaces within and between five different testing days in a group of 17 recreational runners (8 female, 9 male). Specifically, we determined the within-day and between-day intraclass correlation coefficients (ICCs) and minimal detectable changes (MDCs) with respect to discrete ankle, knee, and hip joint angles. When comparing runs within the same day, the investigated Xsens-based joint angles generally showed good to excellent reliability (median ICCs > 0.9). Between-day reliability was generally lower than the within-day estimates: Initial hip, knee, and ankle angles in the sagittal plane showed good reliability (median ICCs > 0.88), while ankle and hip angles in the frontal plane showed only poor to moderate reliability (median ICCs 0.38-0.83). The results were largely unaffected by the surface. In conclusion, within-day adaptations in lower-extremity running kinematics can be captured with the Xsens Link system. Our data on between-day reliability suggest caution when trying to capture longitudinal adaptations, specifically for ankle and hip joint angles in the frontal plane.
Xsens Link 运动捕捉套装已成为一种在实验室外使用可穿戴惯性测量单元研究 3D 跑步运动学的流行工具。本研究在 17 名休闲跑者（8 名女性，9 名男性）中，在 5 天不同测试日内，分别在稳定（沥青）和不稳定（木屑）表面上无约束跑步时，研究了 Xsens 基础下肢关节角度的可靠性。具体来说，我们确定了离散踝关节、膝关节和髋关节角度的日内和日间组内相关系数（ICC）和最小可检测变化（MDC）。当比较同一天内的跑步时，所研究的基于 Xsens 的关节角度通常具有良好到优秀的可靠性（中位数 ICC > 0.9）。日间可靠性通常低于日内估计值：矢状面中的初始髋关节、膝关节和踝关节角度具有良好的可靠性（中位数 ICC > 0.88），而额状面中的踝关节和髋关节角度仅具有较差到中等的可靠性（中位数 ICC 0.38-0.83）。结果基本不受表面影响。总之，Xsens Link 系统可以捕捉到下肢跑步运动学的日内适应性。我们关于日间可靠性的数据表明，当试图捕捉纵向适应性时应谨慎，特别是对于额状面中的踝关节和髋关节角度。
